Re: [PATCH v5 3/3] locking/rwsem: Optimize down_read_trylock()

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To: Waiman Long <longman@xxxxxxxxxx>
Subject: Re: [PATCH v5 3/3] locking/rwsem: Optimize down_read_trylock()
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 22 Mar 2019 10:08:29 -0700
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Linux List Kernel Mailing <linux-kernel@xxxxxxxxxxxxxxx>, "linux-alpha@xxxxxxxxxxxxxxx" <linux-alpha@xxxxxxxxxxxxxxx>, "linux-alpha@xxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>, linux-c6x-dev@xxxxxxxxxxxxx, uclinux-h8-devel@xxxxxxxxxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-m68k <linux-m68k@xxxxxxxxxxxxxxx>, linux-mips@xxxxxxxxxxxxxxx, nios2-dev@xxxxxxxxxxxxxxxxxxxxxx, openrisc@xxxxxxxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, Linux-sh list <linux-sh@xxxxxxxxxxxxxxx>, sparclinux@xxxxxxxxxxxxxxx, linux-um@xxxxxxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, linux-arch <linux-arch@xxxxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Davidlohr Bueso <dave@xxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
In-reply-to: <20190322143008.21313-4-longman@redhat.com>
References: <20190322143008.21313-1-longman@redhat.com> <20190322143008.21313-4-longman@redhat.com>

On Fri, Mar 22, 2019 at 7:30 AM Waiman Long <longman@xxxxxxxxxx> wrote:
>
> Modify __down_read_trylock() to optimize for an unlocked rwsem and make
> it generate slightly better code.

Oh, that should teach me to read all patches in the series before
starting to comment on them.

So ignore my comment on #1.

                Linus

References:
- [PATCH v5 0/3] locking/rwsem: Rwsem rearchitecture part 0
  - From: Waiman Long
- [PATCH v5 3/3] locking/rwsem: Optimize down_read_trylock()
  - From: Waiman Long

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